The Master of Darkness investigates baffling mysteries in two classic pulp thrillers by Walter B. Gibson writing as "Maxwell Grant."

First, a hidden "Death Clue" secreted by Joe Cardona prevents the Master of Darkness from stopping serial murders! Then, disguised as Kent Allard and Lamont Cranston, The Shadow travels from Mexico City to New Orleans to defeat an Aztec murder cult devoted to "Xitli, God of Fire."

BONUS: A lost Shadow classic from the Golden Age of Radio! This instant collector's item showcases the original pulp covers by George Rozen and Graves Gladney plus the classic interior illustrations by Tom Lovell and Earl Mayan, with historical commentary by pulp historian Will Murray.